Traveling-grate furnace.



S. J. MISENER. TRAVELING GRATE FUBNAQE'. APPLICATION nun) MAB. 2'9, 19121,073,359. Patented Sept.'16,1913.

l/V VE/l TOE SHIV/ 80M JOHN M/Sf/VE/P B) HTTOIF/Vf) COLUMBIA PLANOGRAPHCO.,WASHINOTON, D. c.

'iTED STATES PATENT orriou.

SAMPSON JOHN MISENER, F WOODSIDE, DARTMOUTH, NOVA SGOTIA, CANADA.

TRAVELINGGRATE FURNACE.

provements in Traveling-Grate Furnaces;

and I do hereby declare that the following is a full, clear, and exactdescription of the same. 7 This invention relates more particularly tothe bridge piece or arch over which the ashes are discharged to the ashpit in -automatic stoking furnaces of this typeand it has for an objectto provide an improved and simplified construction of such bridge pieceby which entrance of air to the fire chamber at the point where suchbridge piece is located will be prevented.

For further comprehension of the inven tion, and of the objects andthereof, reference will be had to the following description and appendedclaims, and to the accompanying drawings formmg part of thisspecification, in which similar reference characters indicate the sameparts and wherein Figure 1 isa vertical sectional View of the lower partof a traveling grate furnace having my invention applied thereto, andFig. 2 is a horizontal section taken on the line 22 Fig. 1.

Referring now to the drawings 1 indicates the automatic stokingtraveling grate of usual chain construction of a furnace and looped atits opposite ends over a pair of sprocket wheels,2 and 3 respectively,located at the frontand rear of the furnace, while the ash pit intowhich the ashes are discharged from the grate is indicated at 4:. I

have indicated in dotted lines at 5 and 6 the usual hopper and feedcontrol doors of a furnace of this type, such parts however havingnothing to do with the present invention.

Referring now to the features of construction constituting my inventionI provide at the rear end of the grate adjacent the point where it loopsaround the sprocket wheel 3 a pipe 10 extending transversely across thefire chamber 11 of the furnace with its opposite ends embedded in theside walls12 of the furnace as shown most clearly in Fig. 2. Theintermediate portion 10 of this pipe, or that extending over the grate,is of triangular or wedge shape in cross section with the apex of thewedge turned toward advantages Specification of Letters Patent. PatentedSept. 16, 1913.

Application filed March 29, 1912.

Serial No. 687,244.

the front of thefurnace and located quite composed of an inner or bottomplate 18 steel bolted or otherwise suitablyfsecured at its top edgetothe underside of the pipe portlon 10 and at its lower edge to a crossbar 19 embedded at opposite ends in the walls 12. Upon this plate 18 isplaced a layer of asbestos mlllboard or the like upon which restsa layer19 offire brick or suitable refractory material. This layer 19 of firebrick may either be composed of a plurality of bricks of ordinary sizeor of a smaller number of larger bricks molded to the required shapetoform the arch. Toinsure against the bricks in the upper part of the archworking loose I may provide a series of pins 19 fixed to the pipe 10 andprojecting into recesses in the said bricks.

lVater or other suitable cooling medium may be supplied to the pipe 10by means of a second pipe 20 of reduced diameter inserted in the pipe 10near one end thereof, which end projects through the side wall 12 asshown, and extending through the pipe 10 to a point near its oppositeend, the inner end of the pipe 20 being open to cause the water to bedischarged into the pipe 10, the water escaping through an outlet pipe21 leading into the pipe 10 adjacent a cap 22 upon the said end of thepipe 10.

To prevent any tendency of the fuel to form in clinkers a steam pipe 25may extend across the furnace underneath the upper reach of the chain(which constitutes the grate) and adjacent the sprocket 3 this pipehaving upwardly facing perforations 26 through which the steam isdischarged.

lVhat I claim is as follows:

1. In a traveling grate furnace, in combina-tion, a traveling grate, adevice located adjacent the rear end of the grate and adapted to havethe ashes discharged thereover and comprising a metallic member wedgeshaped in cross section with the apex of the wedge toward the front ofthe grate and in close proximity to the latter, means for causing waterto circulate through said metallic member, an arch curving downwardlyand rearwardly from said metallic member and having an inner metallicplate and an outer covering of firebrick.

2. In a traveling grate furnace, in combination, a traveling grate, adevice located adjacent the rear end of the grate and adapted to havethe ashes discharged thereover and comprising a pipe bent to wedge shapein cross section with the apex of the wedge toward the front of thegrate, means for causing water to circulate through said )i 3e an archcurvin backwardl r and down-' 7 C:

wardly from the said pipe and consisting of an inner metallic platesecured at its for- Ward end to the said pipe, a heat insulating liningplaced over such plate, and a covering of firebrick placed over the saidlining.

3. In a traveling grate furnace, in C0111- bi'nation, a traveling grate,a device located adjacent the rear end of the grate and adapted to havethe ashes discharged thereover and comprising a pipe having its endsofcircular cross section and supported in the side Walls of the furnace,the portion of I the pipe between such side walls being bent to wedgeshape in cross section with the apex of the wedge toward the front ofthe grate, a water cooled pipe extending through such wedge shaped pipeand terminating short of one end thereof, an arch curving backwardly anddownwardly from the said pipe and consisting of an inner metallic platehaving its, forward end projecting under and secured to the wedge shapedportion of the pipe, a heat insulating lining placed over such plate, acovering'of firel-n'ick'placed over such lining, and a means comprising;a -;series of pins projecting rigidly'fromthe said pipe and embedded inthe 'said fire brick for securing the latterin position.

In testimony whereof, 'I have signed my name to this specification, inthe presence of two subscribing witnesses.

SAMPSON JOHN MISENER.

Witnesses:

' JAMES STENHAUS R,

DAVID ROWAN TURNBULL.

Copies of this patent may be obtained for five cents each, b5 addressingthe Gommissioner of Patents, Washington, D. C.

